Materials Literature
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Highly mono-sized dye-doped liquid crystal (LC) microcapsules were prepared by the solute codiffusion method for application in photoswitchable devices. Azobenzene derivatives, which can be photoisomerized by irradiation with UV (366 nm) and visible (433 nm) light, were used as a photoresponsive dichroic dye. The micr…
A closed system incorporating FTIR continuous monitoring and GC-MS sampling has been developed to study the generation under UVA illumination of volatile photodegradation products from model plasticised and TiO2 pigmented films. The presence of the plasticiser dibutyl adipate (DBA), at levels of 0-88 phr, has been sho…
Nanosize ferroelectric powders of Pb(Zr,Ti)O/sub 3/ (PZT) have been successfully synthesized by pulsed wire discharge. This has been achieved by the evaporation of Pb, Zr, and Ti wires simultaneously. Since these metals have considerable difference at the boiling point, instant heating by using pulsed-power technology…
Abstract A sample of cobalt oxide with cobalt ions in a highly oxidative state, p‐Co 2 O 3 , was prepared from Co(NO 3 ) 2 (aq) through a precipitation by NaOH and an oxidation by H 2 O 2 . The prepared p‐Co 2 O 3 was characterized as a nonstoichiometric sample with a chemical formula of Co 3+ 0.96 Co 4+ 0.04 O 2− 1.5…
We report a detailed investigation of binary mixtures composed of members of the homologous series of (S)-4′-(2-n-alkoxypropanoyloxy)biphenyl-4-yl 4-n-alkoxy- f-cyanocinnamates. The phase transition curves for these mixtures have no minima. On the contrary, eutectic behaviour was obtained if the members of this homolo…
Abstract Oligophenylazomethines (OPAs) and the aniline‐capped OPAs (OPA's) as soluble model compounds of polyphenylazomethine (PPA) were synthesized via dehydration of 4‐aminobenzophenone in the presence of TiCl 4 or PTS as a Lewis acid. The 1 H‐NMR spectra of OPAs revealed that OPAs have some isomers, which are based…
Recently, we have introduced a method based on geometric considerations, termed geometric direct minimization (GDM), to achieve robust convergence of self consistent field calculations. GDM was limited to calculations involving either spin-unrestricted orbitals or closed shell systems. We report the extension of the G…
The temperature dependences of the thermal conductivity of layered crystals (LCs) of graphite, boron nitride, gallium sulfide, etc., are analyzed. It is shown that the bending branch of vibrations typical of LCs determines the behavior of the thermal conductivity only in the region of its increase. The decrease in the…
Scanning force microscopy (SFM) has been used to probe the local polarization state and piezoelectric properties of ferroelectric films. The conductive SFM tip was employed as a movable top electrode to detect the piezoresponse in the film induced by an ac voltage. Our measurements reveal a spatial dependence of the p…
The processing route of grain oriented electrical sheet was simulated by laboratory trials. Besides MnS, the effect of AIN and NbC as an inhibitor phase in 3 % silicon steel was also investigated. In the hot strip material the niobium microalloyed steel showed the highest volume fraction of the {110}<001> Goss t…
The electronic structures of undoped c ‐ and t ‐ZrO 2 were calculated by a first‐principles molecular orbital method. A preliminary analysis revealed that experimental energy‐loss near‐edge structure profiles obtained in ZrO 2 –8 mol% Y 2 O 3 could be satisfactorily explained from the present theoretical calculation.…
Antenna coupling microwave plasma enables a highly oxidative treatment of the outmost surface of polypropylene (PP) nonwoven fabric within a short time period. Subsequently, grafting copolymerization with acrylic acid (AAc) makes the plasma-treated fabric durably hydrophilic and excellent in water absorbency. With hig…
A batch of 20 diamond detectors obtained by the chemical vapour deposition (CVD) method at the Institute for Materials Research at the Limburg University, Belgium, was investigated with respect to their thermoluminescent (TL) properties. The investigated detectors demonstrate TL sensitivity similar to that of the stan…
Abstract Pure InP nanocrystals were synthesized in aqueous ammonia (potassium stearate, 0.01 mol·L−1) at 170 °C for 12 h. The X-ray diffraction pattern was of the cubic phase with lattice constant a=5.8523±5×10−4 Å. The secondary particles with 180 nm consisting of fine InP NCs with 15 nm in size were found from the t…
The determination of elastic and piezoelectric constants by means of the resonance method is described in detail in the Institute of Electrical and Electronics Engineers Standards. However, in practice, it is not easy to obtain a self-consistent complete set of elastic and piezoelectric coefficients using the resonanc…
Franckeite, approximately Pb 4.6 Ag 0.2 Sn 2.5 Fe 0.8 Sb 2 S 12.6 , consists of alternating pseudohexagonal (H) and pseudotetragonal (Q) layers. Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) of freshly cleaved franckeite, from San José, Bolivia, revealed the atomic structure of the pseudohexago…
Prepregs have become accepted where performance, material qualification and product consistency are paramount requirements, as in aerospace, defence, marine, offshore, mass transit and renewable energy sectors. George Marsh reviews prepreg materials and manufacture.
Chemical adsorption and desorption of hydrogen atoms on single-walled carbon nanotubes (SWNTs) are investigated by using molecular dynamics simulations. It is found that the adsorption and desorption energy of hydrogen atoms depend on the hydrogen coverage and the diameter of the SWNTs. Hydrogen-adsorption geometry at…
AP 5280 is a novel polymer-conjugated platinum anticancer agent currently undergoing phase I clinical trials. It is pharmaceutically formulated as a lyophilized product containing 200 mg platinum per dosage unit. The aim of this study was to determine the reconstitution and dilution fluid of choice, and to investigate…
Abstract A storage study of deep‐fat‐fried banana chips was carried out for 8 weeks at ambient temperature (27 °C), using four types of packaging material: laminated aluminium foil (LAF), oriented polypropylene (OPP), polypropylene (PP) and low‐density polyethylene (LDPE). The physicochemical and sensory characteristi…